Rock Cycle

​Igneous

​Sedimentary

​Metamorphic

​Layers of sediment join together

​Melted rock cools and hardens

​Changes are made from pressure and heat

Rocks become smaller by

• erosion

• wind

• earthquakes

• floods

• rain

• humans​

• earthquakes

• volcanoes

• heat

• pressure​

Rocks change by:

• erosion

• wind

• floods

• rain

• humans​

Rocks become smaller by:

sedimentary Rock

Sedimentary rock is formed when layers of small particles of shell, rock, and sand join together.​

​How Sedimentary Rock is made

• Wind and water break down the earth

• Bits of earth settle in lakes and rivers

• Layers are formed and build up

• Pressure and time turn the layers to rock​

​​Sandstone

​​Limestone

​​Gypsum

Types of Sedimentary Rocks

​​Shale

Fossils

Fossils are the remains or imprints of plants and animals that died long ago.

​

Fossils are usually found in sedimentary rock.​

Metamorphic Rock

Metamorphic rock is formed when pressure and heat creates changes to sedimentary or igneous rock.

What is Metamorphic Rock

• Rocks that have changed

• They were once igneous or sedimentary

• Pressure and heat changed the rocks​

​​Schist

Types of Metamorphic Rocks

​​Gneiss

Igneous Rock

Igneous rock is formed when melted rock cools and hardens.

What is Igneous Rock

• Fire rocks

• Formed underground by trapped, cooled magma

• Formed above ground when volcanoes erupt and magma cools​

​​Granite

​​Scoria

​​Pumice

Types of Igneous Rocks

​​Obsidian